Weird bug with pack_list/1

I'll let the session speak for itself:

λ ~ → swipl
% /home/michael/.plrc compiled 0.00 sec, 3 clauses
Welcome to SWI-Prolog (Multi-threaded, 64 bits, Version 6.5.2)
Copyright (c) 1990-2013 University of Amsterdam, VU Amsterdam
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to redistribute it under certain conditions.
Please visit http://www.swi-prolog.org for details.

For help, use ?- help(Topic). or ?- apropos(Word).

?- pack_list('').
% Contacting server at http://www.swi-prolog.org/pack/query ... ok
l [email protected]             - Bencoding from BitTorrent protocol
p [email protected]              - Collect files and sub-directories from within
a directory
true.

?- pack_list('c').
% Contacting server at http://www.swi-prolog.org/pack/query ... ok
l [email protected]             - Bencoding from BitTorrent protocol
p [email protected]              - Collect files and sub-directories from within
a directory
true.

?- pack_list_installed.
Installed packages (1):

i [email protected]             - Bencoding from BitTorrent protocol
true.

?- pack_list('e').
% Contacting server at http://www.swi-prolog.org/pack/query ... ok
l [email protected]             - Bencoding from BitTorrent protocol
p [email protected]              - Collect files and sub-directories from within
a directory
true.

?- pack_list('condition').
% Contacting server at http://www.swi-prolog.org/pack/query ... ok
p [email protected]           - Condition system a la Common Lisp
p [email protected]              - Collect files and sub-directories from within
a directory
true.

?- pack_install('condition').
% Contacting server at http://www.swi-prolog.org/pack/query ... ok
Install [email protected] from
http://packs.ndrix.com/condition/condition-0.0.1.tgz Y/n?
% Contacting server at http://www.swi-prolog.org/pack/query ... ok
Warning: Package depends on the following:
Warning:   "lambda", provided by [email protected] from
http://www.swi-prolog.org/download/pack/lambda-1.0.0.tgz

What do you wish to do
   (1) * Install proposed dependencies
   (2)   Only install requested package
   (3)   Cancel

Your choice?
% "condition-0.0.1.tgz" was downloaded 4 times
i [email protected]              - Lambda expressions
Package:                condition
Title:                  Condition system a la Common Lisp
Installed version:      0.0.1
Author:                 Michael Hendricks <[email protected]>
Maintainer:             Michael Hendricks <[email protected]>
Packager:               Michael Hendricks <[email protected]>
Home page:              http://packs.ndrix.com/condition/index.html
Download URL:           http://packs.ndrix.com/condition/condition-0.0.1.tgz
Requires:               lambda
Install "condition-0.0.1.tgz" (3,541 bytes) Y/n?
true.

?- pack_list('').
% Contacting server at http://www.swi-prolog.org/pack/query ... ok
l [email protected]             - Bencoding from BitTorrent protocol
l [email protected]           - Condition system a la Common Lisp
l [email protected]              - Lambda expressions
p [email protected]              - Collect files and sub-directories from within
a directory
true.

-- 
"Perhaps people don't believe this, but throughout all of the discussions
of entering China our focus has really been what's best for the Chinese
people. It's not been about our revenue or profit or whatnot."
--Sergey Brin, demonstrating the emptiness of the "don't be evil" mantra.
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